Duplicator



v E. A. OPPENHEINIER.

I DUPLICATOR. APPHCATION FILED APR.J7,1919.

Patented June21, 1921.

2 $HEETS-SHEET 1.

E. A. OPPENHEIMEB.

DUPLICATOR.

APPHCATION FILED APR. 11, 191-9.

Patented June 21, 1921.

2 SHEETSSHEET 2.

UNITED STATES PATENT OFFICE.

EDGAR A. OPPENHEIMER, OF CHICAGO, ILLINOIS, ASSIGNOR T0 SECRETARY OFWAR, TRUSTEE.

NEWTON D. BAKER,

DUPLICATOR.

Specification of Letters Patent.

Patented June 21, 1921.

(FILED UNDER THE ACT OF MARCH 3, 1883, 22 STAT. In, 625.)

T 0 all whom z't may concern:

Be it known that I, EDGAR A. OPPEN- HEIMER, a citizen of the UnitedStates, and a resident of Chicago, in the county of Cook and State ofIllinois, have invented an Improvement in Duplicators, of which thefollowing is a specification.

The invention described herein may be used by the Government, or any ofits officers or employees in prosecution of work for the Government, orby any other person in the United States without payment of any royaltythereon.

Ty invention relates to duplicators or hectographs in which a surface ofabsorbent material is utilized to reproduce writing or drawings, whichare transferred to the surface of the material by means of a suitablereproducing ink.

The object of my invention is to provide a novel form of duplicator bythe use of which several impressions can be successively made from asingle duplicator.

Duplicators or hectographs, as heretofore constructed, have usuallycomprised a tray containing clay or similar material, which provides theabsorbent surface. When it is required to reproduce a number ofdifferent sheets of writing or drawing within a short time, it isnecessary to provide as many trays of absorbent material as there aresheets to reproduce, because of the fact that it takes several hours forthe clay to absorb the reproducing ink, and it is obvious that a. largenumber of such trays are awkward to handle, because of their bulk andweight. Other forms of duplicators have utilized rolls of gelatinizedfabric, which, however, have been found difficult to handle when it isdesired to successively reproduce a number of different sheets.

In my invention I provide a duplicator which comprises a tray containinga plurality of sheets of absorbent material by means of which a numberof different sheets of writing or drawing can be successivelyreproduced. 7

The main object of my invention is to provide a container for the trayhaving means for clamping a sheet thereon to which the writing ordrawing to be duplicated may be transferred. I

In the accompanying drawings:

F lgures 1 and 2 areperspective views of a dupllcator embodying myinvention.

F1g. 3 is a central cross section of the de- VICQ WIth the tray removed.

F 1g. 4 1s a central vertical longitudinal sect on, the tray removed.

Figs. 5, 6 and 7 are detailed views of the parts shown in Fig. 2.

Referring to the drawings, the duplicator conslsts of a box 1 of sheetmetal, or other simllar material, that is provided with a side door 2mounted on hinges 3 and provided 5 Wltll a catch 4:. The top 5 of thebox 1 is provlded at its ends with depressed portions to form steps 6below the surface of the top 5. A tray 7 fits within the box between thesteps 6 and the bottom of the box, as shown in Fig. 1. The top 5 isfurther provided with a hinge hasp 8 having an opening 9 to receive thecatch 4 on the door 2, as best shown in Figs. 3 and 5. Clips 10 aresecured to the steps 6 by means of hinges 11 and extend lengthwise ofthe steps. The clips 10 are adapted to be received in the depressions 12at the ends of the steps 6, the depressions 12 being so formed as totend to hold the clips therein by reason of the resili' ency of thematerial forming the box. The clips 10 project at each end beyond thesides of the box 1, as best shown in Fig. 7, so that they may be removedfrom the depressions 12.

A plurality of sheets 13 of gelatinized fabric, or similar material, arecontained in the tray 7 and are separated from each other by sheets 14of paper or other similar material, of such a nature that the sheetswill not stick to each other when moist or when subjected to abnormaltemperatures. lVhen it is desired to use the duplicator, the tray isremoved from the box 1 and the top sheet 13 is placed on the top 5 andfixed in position by means of the clips 10, which force the end portionsof the sheet 13 into the depressions 12. The writing or drawing to bereproduced is then transferred to the sheet 13 by means of reproducingink, after which, any number of copies are made from the sheet 13 111the usual manner;

If it is desiredto successively reproduce a number of sheets of writingor drawing, the inked sheet is removed from the top of the box and isplaced at the bottom of the tray 7. In this way a number of sheets maybe reproduced until the supply of duplicating sheets 13 is exhausted.The tray is then left in the box 1 until the reproduc drawing to bereproduced is in contact with the sheets to be printed and a sharpimpression is hereby obtained.

I claim as myinvention:

-1. A duplicator comprising a support having depressed end portions toform steps, said steps having depressions, and clips attached to thesteps and adapted to bereceived in the depressions.

"2. A duplicator comprising a support, a top forthe support havingdepressed end portions to form steps, and clips hinged to the steps.

3. A duplicator, including a support, a top for the support havingdepressed end portions to form steps and clips hinged to the steps andioldable thereon.

EDGAR- A. OPPENHEIMER.

